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04-26-2012, 01:32 AM   #1
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Longest Lens that can take 49mm Filters?

Hi

Just wondering what is the longest lens that either:

1) Can take 49mm filters directly; or
2) Can take 49mm filters via a step down ring without vignetting

Yes I know I know, you should buy the biggest filter size you need and step up to them etc... or go square, but I would just like to know others experiences.

Looking at the database the longest I can see is the FA 100 Macro that takes 49mm, however would like to know what else there is...

Thanks

04-26-2012, 01:39 AM   #2
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Many Takumars and M-series are 49mm. The small tidy Tele-Takumar 200/5.6 has 49mm thread. I doubt that you'll find any longer. Some longer vintage lenses with 52-55mm threads might tolerate a step-down ring without vignetting, but those will also tend to be slower.
04-26-2012, 01:55 AM   #3
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the SMC-F 70-210mmF4-5.6 Zoom just shades it
SMC Pentax-F 70-210mm F4-5.6 Reviews - F Zoom Lenses - Pentax Lens Reviews & Lens Database
04-26-2012, 02:35 AM   #4
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100mm macro is longest current lens

04-26-2012, 02:37 AM   #5
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Thanks guys, looks like the old 200 5.6 Tak might be the longest I can go, will check it out
04-26-2012, 04:08 AM   #6
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QuoteOriginally posted by chickenandavocado Quote
Thanks guys, looks like the old 200 5.6 Tak might be the longest I can go, will check it out
I just checked my M 200 f/4.0, it takes a 52mm filter. So I guess the Tak is the longest 49mm (filter) prime lens.
Ron
04-26-2012, 04:44 AM   #7
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Do the math. Aperture is defined as focal length divided by diameter. The inner diameter of a 49mm filter is about 47.5 mm, but realistically the front element diameter of a lens that can accept a 49 mm filter is about 45 mm, therefore, this diameter would define an inverse curve that would be close to focal lengths like 85mm at F2, 135 mm at F3.5 and 200mm at F4.5 (edit note. I initially typed 400 not 200mm)

Note that I have used popular focal lengths and apertures that are close to but not exact, since they are common on the market

Last edited by Lowell Goudge; 04-26-2012 at 06:59 AM.
04-26-2012, 05:21 AM   #8
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QuoteOriginally posted by Lowell Goudge Quote
Do the math. Aperture is defined as focal length divided by diameter. The inner diameter of a 49mm filter is about 47.5 mm, but realistically the front element diameter of a lens that can accept a 49 mm filter is about 45 mm, therefore, this diameter would define an inverse curve that would be close to focal lengths like 85mm at F2, 135 mm at F3.5 and 400mm at F4.5

Note that I have used popular focal lengths and apertures that are close to but not exact, since they are common on the market
interesting, not really following on the maths however i would be interested in knowing a formula to see if a 70-200 f2.8 with 77mm diameter could use a 49mm filter if stopped down to F10 or so?

04-26-2012, 05:27 AM - 1 Like   #9
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The 49'ers on the road ...

QuoteOriginally posted by rbefly Quote
I just checked my M 200 f/4.0, it takes a 52mm filter. So I guess the Tak is the longest 49mm (filter) prime lens.
Ron
Bonjour,

I can confirm as per my M 200/4 ... it's 52mm ... and my D FA 100 Macro WR is 49mm.

I travel a lot with 49mm lenses, so the M 200/4 does not see a lot of action.

Most traveled 49'ers = DA 35/2.4, A 50/1.7 and the aforementioned 100mm ... plus I have recently added a F 35-70 that I have really come to like a lot ...and there's the trusty M 75-150/4 and Taks as well as others.

A+, John Frog

Last edited by Jean Poitiers; 04-26-2012 at 09:56 PM.
04-26-2012, 05:30 AM   #10
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Doesn't the 50-200 WR have a 49mm filter thread?
04-26-2012, 05:36 AM   #11
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Bingo ... we have a winner

QuoteOriginally posted by top-quark Quote
Doesn't the 50-200 WR have a 49mm filter thread?
Bonjour top-quark,

Oui, you're correct here ... and the non-WR 50-200 is a 52mm ... never noticed this difference!

Salut, John Frog
04-26-2012, 06:27 AM   #12
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QuoteOriginally posted by Lowell Goudge Quote
Do the math. Aperture is defined as focal length divided by diameter. The inner diameter of a 49mm filter is about 47.5 mm, but realistically the front element diameter of a lens that can accept a 49 mm filter is about 45 mm, therefore, this diameter would define an inverse curve that would be close to focal lengths like 85mm at F2, 135 mm at F3.5 and 400mm at F4.5
And for those that don't react to unreasonable numbers, I should point out he means 200/4.5, not 400/4.5.

QuoteOriginally posted by chickenandavocado Quote
interesting, not really following on the maths however i would be interested in knowing a formula to see if a 70-200 f2.8 with 77mm diameter could use a 49mm filter if stopped down to F10 or so?
That would depend on the optical design. In practice I doubt you'll find one where it works.
04-26-2012, 06:53 AM   #13
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QuoteOriginally posted by drougge Quote
And for those that don't react to unreasonable numbers, I should point out he means 200/4.5, not 400/4.5.
quite right, unfortunately my mind does not always direct my fingers to where they should go i have since fixed it
QuoteQuote:


That would depend on the optical design. In practice I doubt you'll find one where it works.
i thought about drilling a 49mm hole in a lens cap to try, but that only lasted a nanosecond or so

Last edited by Lowell Goudge; 04-26-2012 at 06:59 AM.
04-26-2012, 09:51 AM   #14
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As I suggested, you can step-down with a legacy FF lens without vignetting. I just put a 49mm ring on my Meyer Telemegor 240/4.5 (52mm thread) with no problem. Many FF lenses with weak edge performance are just fine on APS-C because the smaller sensor crops the edges. Sorry, I don't have a 55mm-thread long lens with me to test, so I'm not sure of the limits.

No, stopping-down to a small aperture won't cure vignetting.
04-27-2012, 07:18 AM   #15
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QuoteOriginally posted by RioRico Quote
As I suggested, you can step-down with a legacy FF lens without vignetting. I just put a 49mm ring on my Meyer Telemegor 240/4.5 (52mm thread) with no problem. Many FF lenses with weak edge performance are just fine on APS-C because the smaller sensor crops the edges. Sorry, I don't have a 55mm-thread long lens with me to test, so I'm not sure of the limits.

No, stopping-down to a small aperture won't cure vignetting.
Thanks all for your replies.

I think stopping down is possible to cure vignetting? I have seen this with using my FA31 with a combination of step down rings / hoods comparing wide open to stopped down (unless I tested incorrectly).
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